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Factors Affecting the Relationship between Laboratory Tests for Soil Phosphorus and Crop Response to Applied Phosphate
Author(s) -
Olson L. C.
Publication year - 1946
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1946.03615995001000c00078x
Subject(s) - yield (engineering) , crop , citation , computer science , phosphorus , library science , operations research , agricultural science , mathematics , environmental science , forestry , geography , chemistry , materials science , organic chemistry , metallurgy
S for the purpose of determining the relationship between laboratory tests for plant nutrients and crop response to these nutrients have been made at the Georgia Experiment Station for a number of years, and the results of some of these studies have already been reported (3). In these studies a good correlation has been shown between the available potash in the soil and the response of cotton to applied potash; but the correlation between laboratory test for acid-soluble phosphorus and crop response to applied phosphate has been somewhat erratic. It is the purpose of this report to present data obtained at this Station showing the relationship between soil tests for acid-soluble phosphorus and crop response to applied phosphate. In addition, factors affecting this relationship will be pointed out. The method used for determining the acid-soluble P2O5 in the soil consists of shaking a i-gram sample of soil for 5 minutes with 10 ml of 0.7 normal hydrochloric acid mixed with ammonium molybdate. Onehalf ml of stannous chloride solution is added to 8 ml of nitrate and the color intensity determined in a photo-electric colorimeter. This method has been compared with £he Truog method (4) for determining soil phosphorus and found to agree' very well with it. Field tests have been conducted on different soil types in Georgia from 1940 through 1945. Results of these tests are reported, together with the laboratory data from these soils. Crops included in this study are cotton, corn, lespedeza, pimientoes, and peanuts.